Method of converting spinning rolls



METHOD OF CONVERTING SPINNING ROLLS Filed May 29, 1952 Fig. I

le MO 18 Fig. 2 O

24 [25 22\ /22 25) 24 Fig. 5 22 E@ IN VEN TOR. KENNETH P SWANSON ATTOR NEYS United States Patent O METHOD F CONVERTING SPINNING ROLLS Kenneth P. Swanson, Abington, Mass.

Application May 29, 1952, Serial No. 290,704

2 Claims. (Cl. 29-148.4)

This invention relates to improved top rolls for spinning machines and to a novel method of convertmg drawing rolls of the solid unitary type into more eliicient drawing roll units of the anti-friction type. The solid unitary type in which two cylindrical drawing rolls are mounted coaxially and non-rotatably on a rotary arbor is very old in the art and is still in use in very large numbers due to the great expense involved in replacing them with the more eflicient anti-friction rolls later developed. A primary object of my invention resides in the development of a novel method of converting these old and inefficient and solid units into the improved and more efficient antifriction units at a minor fraction of the cost of replacement as heretofore known.

The solid unitary type of rolls require a considerable amount of maintenance labor and since both drawing rolls or cots are non-rotatably mounted on the same arbor scuing of the yarn will develop since the cots are kept buled to exact diameter. The improved anti-friction unit resulting from my invention eliminates this and other objectionable features of the solid units and provides a superior and more eticient top roll assembly. The production of a new and improved top roll assembly of this nature comprises a further object of the invention.

These and other features of the invention will be more readily understood and appreciated from the-following detailed description of preferred embodiments thereof selected for purposes of illustration and shown in the accompanying drawings in which- Fig. 1 is an elevation of a drawing roll unit of the solid unitary type,

Fig. 2 illustrates in elevation the unit disassembled in accordance with my invention,

Fig. 3 is an elevation of the arbor shown in Fig. 2 moditied in accordance with my invention,

Fig. 4 illustrates in side elevation and in section an improved unit resulting from my invention, and

Fig. 5 is a view like Fig. 4 but showing a modified construction.

The solid unitary drawing unit illustrated in Fig. 1 comprises a one-piece metal arbor having two cylindrical drawing rolls or cots 12 non-rotatably aixed to end portions 14 at opposite sides of a middle section 16. The ends 18 of the arbor are adapted to be supported in bearings rotatably mounting the unit.

The lirst step of my converting process resides in the removing of the cots 12 from the arbor as illustrated in Fig. 2. The next step resides in machining the end portions 14 of the arbor each to a reduced cylindrical diameter smaller than the middle section 16. This machining results in the formation of cylindrical end portions 20 together with an annular shoulder 22 at the inner end of each portion 20. The ends 18 of the arbor are formed into threaded studs 24 of reduced diameter. The studs 24 are integral with and extend outwardly from the end of each portion 20 and this operation furthermore produces an outwardly facing annular shoulder 25 at the junction of each stud with its cylindrical portion 20.

The improved anti-friction unit shown in Fig. 4 employs the converted arbor shown in Fig. 3 together with the combination now to be described. The cots 12 are each mounted on a cylindrical sleeve 26 reamed out at 28 at its two ends. Two bearing sleeves 30 mounted on an end portion 20 of the arbor and carrying bearing balls 32 within annular races 34 are adapted to rotatably snpport each cylindrical sleeve 26 with its cot 12. An an- Patented Mar. 22, 1955 F ICC nular dust sealing member 36 is disposed against the shoulder 22 at one end of the inner sleeve 30 and a like sealing member is disposed at the outer end of the outer sleeve 30. A nut 38 threaded to the stud 34 is tightened 5 into abutting contact with the shoulder 25 whereupon the inner face of the end provides an annular shoulder opposing the shoulder 22 and between which the rotary unit is supported against axial movement.

The sleeve 26 is rotatably supported on the balls 32 at the inner ends of the annular recesses 28 and when assembled as illustrated the assembly supports the rotary unit 26-12 against axial movement. The members 36 are also disposed within the ends of the cylindrical sleeve 26 and protect the anti-friction bearings against exposure and dust.

The form of the invention illustrated in Fig. 5 employs anti-friction bearings of the Oilite sleeve type in lieu of the ball bearings shown in Fig. 4. In this case the ends of the cylindrical sleeve 46 are reamed out to receive the Oilite bearings 48. The assembly and its functioning are otherwise like that shown in Fig. 4.

It will now be apparent that I have at minor cost converted the rotary heavy and solid unit of Fig. 1 into a rotary light anti-friction unit of the type shown in Figs. 4 and 5. The cot assemblies 26-12 and 46-12 are adapted to spin freely on the arbor and are supported against axial movement without the requirement of line tolerances necessary in the anti-friction mountings heretofore known.

Having thus disclosed my invention what I claim as new and desire to secure by Letters Patent is:

1. A method of converting solid unitary liber drawing units, each embodying a one-piece metal arbor having two cylindrical and coaxial drawing rolls non-rotatably axed to end portions thereof at opposite sides of a middle section, into anti-friction drawing units each embodying one of said arbors with drawing rolls rotatably mounted thereon, which consists in removing the first named rolls from the arbor, machining said end portions of the arbor each to a reduced and cylindrical diameter smaller than the said middle section and forming outwardly facing annular shoulders at the junctions of the reduced end portions with the middle section, mounting said drawing rolls each on a cylindrical sleeve to provide rotatable drawing members, rotatably mounting one of said drawing members on anti-friction bearing means on each of said reduced end portions, and securing each of said drawing members against axial movement on the arbor between its adjacent outwardly facing shoulder and a cooperating inwardly facing annular shoulder secured to the adjacent outer end of the arbor.

2. The method defined in claim 1 plus the step of machimng each tip end of the arbor to form a stud of still further reduced diameter and an outwardly facing shoulder at the junction of each stud with the adjacent reduced end portion, threading each stud, and mounting on each threaded stud and into contact with the adjacent outwardly facing shoulder a threaded nut of a diameter greater than that of the adjacent reduced end portion, said nitup'oviding said cooperating inwardly facing annular s o er.

References Cited in the tile of this patent UNITED STATES PATENTS 1,035,421 Coppins Aug. 13, 1912 1,220,719 Biggin Mar. 27, 1917 1,324,756 Schatz Dec. 9, 1919 1,418,152 vLogan May 30, 1922 1,665,136 Lauffer Apr. 3, 1928 1,742,454 Van Derhoif Jan. 7, 1930 1,884,104 Moore Oct. 25, 1932 2,164,426 Renfroe July 4, 1939 2,344,147 Hutchinson Mar. 14, 1944 2,355,511 Cobb Aug. 8, 1944 2,621,374 Waite Dec. 16, 1952 FOREIGN PATENTS 438,208 Italy Iuly 27, 1948 

